Niall Horan and Louis Tomlinson Party in Las Vegas

Niall Horan and Louis Tomlinson partied in Las Vegas last night, May 16. The duo was joined by their friend, and fellow UK singer, Ed Sheeran.

The group  of guys is in Las Vegas to attend the Billboard Music Awards tonight, May 17. One Direction is nominated for several awards and will present at the show while Ed is set to perform.